Hotkey for flagging as reject in culling mode

In "competing product abbreviated LR", you can quickly hit the "X" key to flag an image as rejected during culling. This is because a keyboard is an extremely time-efficient tool when culling, compared to mice.

Could we please, get something similar to the culling mode for 16.3 as a gift? I mean, the advances we've had so far with grouping, etc, has already reduced time spent on culling by a lot, but it could most definitely be improved further.

Another great tool we would want, is a compare view for groups (with "select" and "candidate", which again needs the quick rejection hotkey)

Thanks for making life easier for us, so we can spend less time sorting pictures, and more time enjoying photography! :)